WO2009088238A2 - Artificial knee joint for preventing ligament injury - Google Patents

Artificial knee joint for preventing ligament injury Download PDF

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Publication number
WO2009088238A2
WO2009088238A2 PCT/KR2009/000104 KR2009000104W WO2009088238A2 WO 2009088238 A2 WO2009088238 A2 WO 2009088238A2 KR 2009000104 W KR2009000104 W KR 2009000104W WO 2009088238 A2 WO2009088238 A2 WO 2009088238A2
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WO
WIPO (PCT)
Prior art keywords
femur
ligament
chamfer
joint member
rear
Prior art date
Application number
PCT/KR2009/000104
Other languages
French (fr)
Korean (ko)
Other versions
WO2009088238A4 (en
WO2009088238A3 (en
Inventor
Doo-Hoon Sun
Yong-Sik Kim
Jung-Sung Kim
Byung-Soo Kim
Jai-Gon Seo
Woo-Shin Cho
Hyun-Kee Chung
Myung-Chul Lee
Original Assignee
Corentec Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR10-2008-0002244 priority Critical
Priority to KR1020080002244A priority patent/KR100901528B1/en
Application filed by Corentec Inc. filed Critical Corentec Inc.
Publication of WO2009088238A2 publication Critical patent/WO2009088238A2/en
Publication of WO2009088238A3 publication Critical patent/WO2009088238A3/en
Publication of WO2009088238A4 publication Critical patent/WO2009088238A4/en

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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/38Joints for elbows or knees
    • A61F2/3886Joints for elbows or knees for stabilising knees against anterior or lateral dislocations
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/38Joints for elbows or knees
    • A61F2/389Tibial components

Abstract

This invention relates to an artificial knee joint which can prevent the injury of a ligament and replace a natural knee joint. More particularly, this invention relates to an artificial knee joint which includes: a femur joint member which is joined to an end portion of a tibia near a femur; a tibia joint member which is joined to an end portion of the femur near the tibia; and a bearing member which is placed between the femur and tibia joint members. A chamber is formed at an end portion of a posterior condyle in the femur joint member to prevent the injury of a ligament caused by the flection of the femur joint member in the case of knee exercise. In addition, a CR type operation is used in the insertion of the artificial knee joint in order to preserve the posterior cruciate ligament. At this time, as there is the possibility that the posterior cruciate ligament may be injured due to the flection of the femur joint member, an additional chamber is formed at an inner side of an end portion in the posterior condyle. Furthermore, a chamber is formed at a posterior protrusion in the bearing member to prevent a ligament from colliding against the bearing. Consequently the injury of the ligament can be prevented. For this purpose, the artificial knee joint includes: the femur joint member that is joined to an end portion of a tibia near a femur; the tibia joint member that is joined to an end portion of the femur near the tibia; and the bearing member that is placed between the femur and tibia joint members, the end portion of the posterior condyle at the femur joint member includes an external chamber to prevent the collision of a lateral ligament against the femur joint member. Provided is an artificial knee joint that is able to prevent injury to a ligament.

Description

Artificial ligament for preventing damage to the knee

The present invention relates to an artificial knee joint to replace a knee joint, and more particularly, with the femur joint member which is coupled to the tibial end portion of a femur, and the tibia joint member which is coupled to a femoral-side end of the tibia, the femur joint member and in the artificial knee joint consisting of a bearing element positioned between the tibia joint member, wherein by forming a chamfer on the end of the rear condyles (posterior Condyle) of the femur joint member to the case in the knee movement to prevent the ligament It relates to an artificial knee joint that allows to prevent the femur joint member due to damage to the ligament by twisting rotation or the like. In addition, the artificial knee joint of the present invention there is that the total knee surgery to CR type case holding the posterior cruciate ligament, this time in accordance with the twisting rotation of the femur joint member, because it may damage the posterior cruciate ligament of the posterior condyles end and to prevent this, by forming a separate chamfer on the inside, or may be to prevent damage to the ligament by preventing ligament bumping to form a chamfer on the rear protrusion even in the bearing member.

Of countless joints that make up the body, the knee is a joint connecting the tibia and femur, the patient due to aging and wear and accidents of the knee bone tissue is placed in an unrecoverable state has gradually increased. The knee is the bottom of the femur and tibia top and the rear legs bend features as the knee joint between the back of the patella (knee) as the knee joint.

Is pyeoju the lap of (femoral articular patellar) quadriceps back of the kneecap is 4mm through and covered with cartilage, 6mm thick, while moving the articular surface of the distal anterior thigh bone (femur) in the blood courses knees bent down It enhances strength. When you walk the flats patella-femoral joint is the pressure exerted on the applied weight is 8 times the force when that happen, and the half of the weight, sat squat when you go up the stairs three times the weight. Capsule begins from the edge of the femur lower end is attached to the upper edge of the tibia. Soon as the inner and outer collateral ligaments, the enhanced binding of the bone by the ligaments, including the many durable dew cruciate ligament in the joint capsule outside is at the same time limiting the movement direction and range.

Looking at the symptoms of knee joint meniscus cartilage damage, joint meniscus is located between a cartilage located between the femur and the tibia forming the knee joint, cartilage gives to cushion the impact of the knee joint, nutrients to the articular cartilage supply, and provides the stability of the joint and the knee joint and facilitate movement at the same time, serves to transfer the weight bearing.

Usually joint meniscus is there consists of meniscus and meniscal outside inward, in the European and American inner meniscal only large are mobile and easily damaged less significant two meniscus damage the inner meniscus than the outside, in the country rather than outside damage it is known that a lot.

Damage to the meniscus cartilage damage often occurs during one of the frequent occurrence in the knee, sports or hiking or injuries of everyday life. When the rotation is applied in the state in which the knee is bent movement, ie saenggimyeo well as torsional forces occur in the knee joint, may be applied if there is severe external damage, such as cruciate ligament collateral ligament, tibial fractures can be accompanied.

Most of the complications that occur in these patella is a special trauma symptoms can occur without the cause is patellar - if there is a structural and functional abnormality of the hip joint. Bridge if the abnormal if bent outwards and feet heavily back outward to include patellar - if applied repeatedly force the hip joint can occur leukomalacia of articular cartilage, did not use a long-term knee even quadriceps weakness and It can be caused by construction. Patella-femoral joint structure if there is more than able to wear a brace to stabilize the patella and may also be a surgical procedure that way that if damage is severe replaced with an artificial knee joint.

The latest joint and a non-patient recovered with a serious damage to the part is performed well, the procedure for replacing artificial joint, such a motion region of the artificial joint has a metal or ceramic or polyethylene is used has excellent mechanical properties and coefficient of friction it is smaller It can enhance biocompatibility. Typically knee has been divided into a portion corresponding to the portion of the cartilage between the femur and the tibia part and the femur part and the tibia part of the bearing portion. The femur part and the tibia part is mainly used a metal alloy, the cartilage part is made of polyethylene. Tibia part is secured by an insertion part to be inserted into the knee joint side end of the tibia. The insert is fixed by the bone marrow of the tibia. However, when the case is applied the repetitive load by the knee joint, it is difficult to achieve a sufficient effect by a structural failure of the knee, or when the femur portion and the tibia portions damaged by the load to be sustained, in particular the bearing portion is broken It is generated to cause a big problem.

In the case of such a conventional artificial knee joint is also as shown in the conventional artificial knee joint 1, first the cutting the tibia-side end part of the femur (1) The combination of the femur joint member 10 is fixed, of the tibia (3) the femur-side end portion is cut tibia joint member 30 to the fixing portion is bonded. Next, the bearing member 50 is located between the contact portion 13 and the groove portion 51 is contacted by tropism (Flection) of the knee joint is located on the upper surface of the bearing member 50 of the femur joint member 10 is to enable. However, so when the case of the combined conventional artificial knee joint is also bent at the upper surface of the femur joint member 10 has the bearing member 50, as shown in elevation in the first movement it is possible for only the movement in the front-rear direction no. That is, the knee joint of an actual human body is the tibia is, not only before and after exercise, and that some of the twisting rotation Accordingly, when the artificial knee joint surgery bearing at the contact surface of the bearing member 50 and the femur joint member 10, member ( 50) rotates on the upper surface of the plane is generated. Due to this plane torsional rotation and brought into collision with the rear end of the ligament to the condyles (Posterior Condyle) of the femur joint member 10 is present on the side eventually sometimes results in damaging side ligaments.

In the conventional artificial knee joint surgery There are treatment of CR-type and PS-type, where the CR type is an artificial knee joint type in the case of surgery the knee in the condition fails to remove the PCL, PS type is the posterior cruciate ligament in the removed state refers to a type of the artificial knee joint to replace the cruciate a post of the bearing member. In case of treatment with the artificial knee joint is by the outer edges of both posterior condyles end of the femur joint member problem of damage by collision with the side ligament when the rotating twisting in the plane on the top surface a bearing member above the femur joint member is generated . In addition, although the case of the artificial knee joint of the PS type, since the place of the posterior cruciate ligament removed due to the cam on the post and the femur joint member of the bearing member, but there is a risk of damage to the problem of the posterior cruciate ligament in the heart, the CR for the type of the artificial knee joint is by the inner edge of the rear condyles end of the femur joint member, if so the procedure the knee while maintaining the posterior cruciate ligament is the femur joint member constituting the twisting rotation on the upper surface of the bearing member wherein is generated a problem of the posterior cruciate ligament is damaged.

Also, look at the rear projecting from the bearing member of the conventional artificial knee joint, although it protrudes at a lower height, and when the knee is fully unfold because the bending of the slight forward the posterior ligament of the rear projecting portion of the bearing member conflicts It is generated, if applicable. This eventually posterior ligament may be damaged, this may involve pain, and severe according should also lead to diseases caused by inflammation.

The present invention has been made in view of solving the problems of the prior art, an object of the present invention, the lateral ligament collision by the outer edge of the femur joint member in the conventional artificial knee joint are the femur joint member by a plane horizontal axis rotation to the bar doeeotneun the problem of ligament damage, in the artificial knee joint of the present invention, including outer chamfer on the outside edge of the posterior condyles end of the femur joint member can prevent the ligament by preventing interference with the side ligament which allows to provide an artificial knee joint.

It is another object of the present invention, the posterior cruciate ligament, which are located on the inside with respect to the artificial knee joint of a conventional CR type according to a plane horizontal axis rotation of the femur joint member is brought into collision to the inner edge iteotneun the problem of ligament damage the bar, whereby the rear joint of the femur joint member obtained by an inner chamfer on the end inner edge to provide an artificial knee joint which, to prevent the ligament from being damaged by preventing the collision with the posterior cruciate ligament.

It is another object of the present invention was the case where the rear ligament ligaments are damaged by impact on the rear projection of the bearing member caused by the prior art knee joint in the knee there is a bending of a few of the front case is completely straighten, these in order to prevent to provide an artificial knee joint that allows to prevent the ligament, including posterior chamfer on the rear projection of the bearing member.

It is another object of the present invention, also because in the conventional artificial knee joint to the impact of the ligament involve pain and severe the bar doeeotneun to cause inflammation is caused disease, in order to prevent this, the chamfer on the femur joint member and the bearing member the couple to provide a more stable knee.

The invention will be implemented by the embodiment has the following configuration to achieve the previously mentioned objects, includes a configuration as described below.

According to one embodiment of the invention, between the femur joint member which is coupled to the artificial knee joint of the femur ends in accordance with the present invention, a tibia joint coupled to the tibial end member, the femur joint member and the tibia joint member in the artificial knee joint including a position bearing member, the femur joint member is that to prevent the ligament by including a chamfer outside chamfer at the outer edge of the rear condyles end of preventing the collision with the side ligament It characterized.

According to another embodiment of the invention, the artificial knee joint are the femur joint member according to the present invention ligament as to further comprise a inner chamfer chamfer on the inner edge of the rear condyles end of preventing the collision with the posterior cruciate ligament the is characterized in that to avoid.

According to a further embodiment of the present invention, the artificial knee joint according to the invention the outer chamfer is characterized in that a chamfer with a gentle convex curved surface.

According to a further embodiment of the present invention, the artificial knee joint according to the invention the inner chamfer is characterized in that a chamfer to smooth concave curved shape to the inside of the constriction.

According to a further embodiment of the present invention, the artificial knee joint according to the invention wherein the bearing member comprises a rear projecting portion projecting upwardly from the rear, and the rear projection comprises a rear chamfer formed by a predetermined depth chamfers downward , the rear chamfer is characterized in that to avoid the collision with the ligament.

According to a further embodiment of the present invention, the artificial knee joint according to the invention the rear chamfer is characterized in that a chamfer with a gentle curved surface with concave depressions.

According to a further embodiment of the present invention, the artificial knee joint according to the present invention, in the femoral engaging portion coupled to the femur end, the chamfer at the outer edge of the rear condyles end of the femur joint member with a smooth convex curved surface including outer chamfer is characterized in that in order to prevent damage to the ligament by preventing interference with the side ligament.

According to a further embodiment of the present invention, the artificial knee joint according to the invention the femur joint member further comprises an inner chamfer chamfer with a smooth concave curved surface shape of the constriction to the inside from the inner edge of the posterior condyles end It characterized in that in order to prevent damage to the ligament by preventing the collision with the posterior cruciate ligament.

According to a further embodiment of the present invention, the artificial knee joint according to the present invention provides a bearing member between the femur joint member and the tibia joint member, the bearing member comprises a rear projection projected upwardly from the rear the rear projection comprises a chamfer posterior chamfer with a gentle curved surface of concave depressions, characterized in that to the rear chamfer is to avoid the collision with the ligament.

According to a further embodiment of the present invention, the artificial knee joint according to the invention wherein the bearing element further comprises a front projection projecting upwardly at the front, said front projection is smooth is formed higher than the height of the rear projecting It characterized in that to prevent the dislocation of the knee and forward movement.

As described above, the present invention can be attained the following effects by the above-described problem solving means, which will be described later, and configured with the combination, the operating relationship.

The present invention, by the rotation phase that the femur joint member flat horizontal axis by the outer edge of the femur joint member in the conventional artificial knee joint is that the lateral ligament crash bar doeeotneun the problem of ligament damage, in the artificial knee joint of the present invention including outer chamfer on the outside edge of the rear end of the femoral condyles engaging member by preventing the collision with the side ligament it can be made more effective in order to prevent damage to the ligament.

The present invention, the posterior cruciate ligament, which are located on the inside with respect to the artificial knee joint of a conventional CR type according to a plane horizontal axis rotation of the femur joint member is brought into collision to the inner edge iteotneun the problem of ligament damage the bar, whereby the femur bond nine rear joint member including an inner chamfer on the end of the inner edge can be achieved an effect that, to prevent the ligament from being damaged by preventing the collision with the posterior cruciate ligament.

The present invention was the case where the rear ligament ligament is damaged by collision to the rear projection of the bearing member caused by the prior art knee joint in the knee there is a bending of a few of the front case is completely straighten, in order to prevent such the rear protruding portion of the bearing member can be made more effective in order to prevent damage to the ligaments, including the posterior chamfer.

The present invention, the ligament will place the chamfer on the femur joint member and the bearing member to also involve pain because in the conventional artificial knee joint to the impact of the ligament seriously the bar doeeotneun the disease by causing inflammation, to prevent this nor not accompanied by pain, it is possible to achieve an effect that is capable of forming a more stable knee.

1 is a view showing a state of the conventional artificial knee joint, the procedure

Figure 2 is a rear view of a conventional PS type artificial knee joint femur joint member of the

Figure 3 is a rear view of a conventional CR type artificial knee joint femur joint member of the

Figure 4 is a view showing a conventional artificial knee joint plane horizontal axis twisting rotation of

Figure 5 is a view showing a conventional artificial knee joint plane horizontal axis twisting rotation of

Figure 6 is a rear view of the PS type artificial knee joint femoral joint member in accordance with one embodiment of the present invention

Figure 7 is a rear view of the CR type artificial knee joint femoral joint member in accordance with one embodiment of the present invention

8 is a perspective view of the bearing member in the artificial knee joint according to another embodiment of the present invention

Hereinafter reference to the accompanying drawings, a configuration and an exemplary embodiment of the knee protection apparatus for a damaged ligament according to the present invention will be described in detail.

Figure 2 is a rear view of a conventional PS type artificial knee joint femur joint member of FIG. 3 is a rear view of a conventional CR type artificial knee joint femur joint member, the diagram Figure 4 illustrates the prior art artificial knee joint plane horizontal axis twisting rotation of and, Figure 5 is conventional, and a view showing the artificial knee joint plane horizontal axis twisting rotation, Figure 6 is a rear view of the PS type artificial knee joint femoral joint member in accordance with one embodiment of the present invention, Figure 7 of the present invention one implementation is a rear view of the CR type artificial knee joint femoral joint member in accordance with the example, Figure 8 is a perspective view of the bearing member in the artificial knee joint according to another embodiment of the present invention.

Before a description of the artificial knee joint according to the invention, Figures 2 and due to the outer edge (19a) and an inner edge (19b) of the posterior condyles end 19 of the femur joint member 10 of the conventional artificial knee joint of Figure 3 look for a ligament, must look at the problem of the ligament damage in the conventional artificial knee joint shown in FIGS. 4 and 5 with the plane twisting rotation of the horizontal axis of the femur joint member 10 and the bearing member 50 . First, in FIG. 2 includes the femur joint member 10 has a rear condyles end outer edge (19a) thereto as shown for the femoral member 10, the PS type of prior art to remove the posterior cruciate ligament and treatment in the artificial knee joint, and because Figures 4 and by a flat surface when the horizontal axis twisting rotation, the posterior condyles end outer edge (19a) coming out of the femur joint member 10 has the bearing member 50, as shown in Figure 5 It will collide with the side ligaments. Thus the side ligament may be damaged by the impingement and frequent friction or the like, causing pain and inflammation they cause occurs when severe. Then 3 is directed towards a city with respect to the femur joint member 10 to the conventional procedure without removing the posterior cruciate ligament in the knee, whereby according to the femur joint member 10 has an inner edge with the rear condyles end (19) ( It includes the 19b). In the rear end condyles inner edge (19b) it is brought into collision with the posterior cruciate ligament in the middle when the femur joint member 10 is twisted in accordance with the rotation of the horizontal axis plane of the bearing member 50 as described above. Thus the posterior cruciate ligament is damaged, it becomes a problem that it causes pain and inflammation. To address these problems the artificial knee joint of the present invention is to avoid this by forming a chamfer at the rear end condyles of the femur joint member.

Hereinafter, referring to FIGS. 6 to 8 the artificial knee joint of the present invention will be in view at detail. Of the present invention the artificial knee joint of the cartilage between the the femur joint member 100 and the tibia joint member shown in the femur joint member 8 and 100 coupled to a tibia-side end lower portion of the femur illustrated in Figs. 6 and 7 and a bearing member 500 which serves. In the femur joint member 100, and friction contact with the bearing member 500, the bearing member is subjected to stress due to load carried at the upper portion of the femur joint member. Further, the femur joint member and the bearing member there is contact, when the bridge is moved due to the ligament, the tibia is moved back and forth, it is possible also be moved from side to side. Therefore, it is preferable that as the knee joint moves such that the contact portion of the femur joint member and the bearing member so as to maintain the various contacts of the curvature, which is to so as to properly disperse the stress.

The femur joint member 100 is tinged the overall U-shape made of a material of the biocompatibility, the upper part has a region with a capacity to be the femur is a bond, lower part has a curved surface having a different curvature close to the slightly rectangular . The femur joint member 100 by cutting a portion of the femur and to be accommodated in the femur joint member 100 and is added to the femur receiving formation which is located on the inside of the U-shape, the femur and further from the femur receiving part and a fixing projection, which so as to be rigidly coupled. In addition, of the femur joint member which, and the femur joint member 100 when includes the curved surface shape of the bearing member contact portion 130 is brought into contact with the bearing member 500 to be described below, designed in the artificial knee joint of the PS type If both include rear condyles (posterior Condyle) posterior condyles end 190 which is located in the rear ward end of the joint of the femur joint member, and includes a cam 170 connected between.

The femur receiving part is joined firmly to the femur lower cleavage plane as a portion corresponding to the inner upper portion of the U-shape of the femur joint member 100. The surface of the femoral head receiving portion will have a rough surface to be coupled securely with the femur, or preferably is made of an porous material. The fixing projections If the like engaging in the shape that can hold a screw-shaped or, the intergranular in the femur bone tissue of the securely the femur as a protrusion which is formed so as to be inserted and intergranular the femur to the upper side the femur receiving portion be more desirable will be.

Preferably made of a shape so as to in contact with the groove 510 of the bearing member 500, a wider contact area when the femur moves as much as possible naturally dispersing stress to be described below is the bearing member contact 130 Do. Thus the bearing member contact portion 130 is that the curvature of the contact portion when viewed from the contact of curvature and the front part of the, as seen from the side so as to have a different bar, thus different curvatures with a natural movement is possible in the movement of the knee joint before and after the by at the same time, so as to disperse the stress by increasing the contact area, broadly maintain the contact area in the portion being a large stress on the other side, even if p is the contact which is sounding slightly focused even if the abduction slightly from side to side stresses It is to be distributed to this.

The cam 170 has posts on the artificial knee joint a bearing member 500 that will described below in place of the role of the posterior cruciate ligament if the artificial knee joint of the PS type of treatment while removal of the posterior cruciate ligament of the present invention ( engagement with 570) as to its function and position in the rear condyles of the femur joint member 100. Such the cam 170 will be omitted the detailed description that follows to be present in the artificial knee joint of a conventional PS type.

The posterior condyles end 190 is able to configure a chamfer, which is the core of the present invention at the end in the U-shape of the femur joint member 100 to the part that refers to the joint sphere end of the rear side ligament damage can be prevented. The posterior condyles end 190 includes an inner chamfer (193) which in order to prevent the outer chamfer 191 in the case of the artificial knee joint of the CR type of damage to the posterior cruciate ligament that allows to avoid damaging the side ligament do.

The outer chamfer 191, as shown in Figs. 6 and 7 in the as conventional femur joint member 10 of Figure 2 shown in that the formation of the chamfer at the rear condyles end outer edge (19a) 4 and 5 when the femur joint member to the horizontal axis plane torsional rotation of the bearing member is configured to prevent the rear of the condyles sticking out of the outer edge (19a) end of the side ligament damage. In the outer chamfer 191. The rear condyles end outer edge is one it is preferred to be formed as a curved surface shape, which outer edge (19a) of the rear condyles end gradually, as shown in Figs. 6 and 7 of the formed the it is because, even though there is formed a chamfer may occur and it may take the side ligament, may result in a hindrance to the smooth bending motion (Flection) of the knee joint when the cutting in a state with each. It may be possible to allow the femur joint member 100 may not damaging the ligament of the side, even if the horizontal axis of the plane twisting rotation via the femur joint member 100 which includes the outer chamfer 191 .

The inner chamfer 193 of the as inde chamfer formed on the rear joint sphere inner edge of the femur joint member from the artificial knee joint of the CR type of the prior invention, due to this inner chamfer 192 of the CR type artificial knee joint shown in Figure 7 If the function to allow the femur joint member 100 is to prevent the ligament, without conflicting with the posterior cruciate ligament in the heart Although the plane horizontal axis rotation of the bearing member. The inner chamfer 193 is preferred to be formed to have a smooth concave curved surface shape of the constriction to the inside, which is in the groove 510 of the bearing member 500 in a state the femur joint member 100 is true enough bend when a plane horizontal axis twisting rotation because the inner edge of the rear end of condyles 190, preferably as close to the ideal circular shape for preventing collision in accordance with the twist rotation because it may cause conflicts with the posterior cruciate ligament. That is, a shape for preventing the collision with the posterior cruciate ligament of the horizontal axis to rotate the posterior cruciate ligament to the axis so as to have a concave shape in the shape of the inner chamfer (193) of the constriction.

The bearing member 500 includes a foreign matter according to alternatively as there is plays a role similar to the body's cartilage, and thus the material of the femur joint member and the tibia joint member wear to and from the femur joint member 100 and the tibia joint member this is because heat is not generated due to friction does not come out and be resistant to friction, it is preferable to form the material Wars surface is smooth to enable the natural frictional contact of polyethylene. The bearing member 500 has both ends of the bearing member 500 when viewed from the side with the groove (Groove, 510) when the upper part viewed from the front of the contact portion 130 of the femur joint member 100 in contact formed to include a front projecting portion 530 and the rear projecting portion 540. It may also include a post 570, which allows to replace it, because the posterior cruciate ligament is removed when the treatment procedure with the PS type artificial knee joint of the present invention.

The groove (Groove, 510) is a bearing member contact portion 130 in this region is the femur joint member 100 as the recessed portions formed in the both directions of the artificial knee joint of the present invention as seen from the front of the bearing member 500 when in contact with the femur joint member 100 rotates a part which is friction. Therefore, it is necessary to prevent the load of the stress is concentrated, so to focus on the area to widen the contact area as much as possible in accordance with the contact. Thus, the groove 510 it is preferable to have a curvature corresponding to the bearing member contact portion 130 of the femur joint member 100. As a result of being able to reduce the effect to the stress due to geotinde bit is influenced contact only one side if audible to be stress is concentrated, the contact area increases as described in the configuration of the bearing member contact portion 130 can be dispersed will be.

The front protrusion 530 and the rear protrusion 540 can be formed to different height as the portion projecting to the upper side in the front and rear of the bearing member 500, the rear height of the front projecting portion 530 formed to be higher than the height of the protrusion 540, which is intended to be able to prevent the natural knee movement and anterior dislocation. The front protrusion 530 and the rear projection 540 as seen from the side of the bearing member 500, inde a predetermined height projected from the front and rear areas, in particular the front projection 530 of the rear projection to the height so that patients who underwent the artificial knee joint of the present invention to increase a portion than a height of 540 can be prevented when bending the knee at a large angle the femur joint member 100 is released from the bearing member 500 and, in the case to form the rear projection 540 is lower than the height of the front projecting portion 530, the height of the knee is bent at a large angle to roll back and prevent dislocation and to enable a stable knee joint movement. In the above there is a case the rear projecting portion 540 when the knee is fully straighten bent in a slightly forward, so that to prevent this, so that occurs when the ligaments of the back projection and rear hit ligament damage the posterior chamfer ( 541) a.

The posterior chamfers 541 could result in pain and inflammation by the case in which the posterior ligament is damaged by contact with the posterior ligament although the rear projection that although low extrusion occurs in the bearing member as a core of the present invention. In order to solve this problem it was to form a chamfer with a concavely the constriction smooth curved surface as shown in Figure 8 to the rear projection 540 to prevent the rear ligament are encountered. Eventually to realize the purpose to avoid damaging the ligament THE INVENTION The present through the rear chamfer 541 can be prevented from interference with the rear ligament invention it is possible to realize a more stable knee.

The post 570 is configured to replace the role of the posterior cruciate ligament is removed when the artificial knee joint of the present invention as a portion protruding upwardly at a central portion of the bearing member 500, the PS type procedure. This configuration of the post 570, so the contents can be seen fully self having ordinary skill in the art will be omitted the detailed description that follows.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the operating relationship and use of the artificial knee joint device status in accordance with the present invention will be described in detail.

Figure 6 is a rear view of the PS type artificial knee joint femoral joint member in accordance with one embodiment of the present invention, Figure 7 is a rear view of the CR type artificial knee joint femoral joint member in accordance with one embodiment of the present invention, Fig. 8 It is a perspective view of a bearing element in the artificial knee joint according to another embodiment of the present invention.

6 through reference to FIG Referring to the artificial knee joint operation relationship of the present invention, when the first to describe the artificial knee joint according to one embodiment of the present invention will be described with reference to Figure 6 the femur joint member 100 includes a rear condyles end when the present invention including the outer chamfers 191 to 190, a total knee ligament surgery prevent collision with the side to serve to prevent the ligament from being damaged. This fact obtain, not of the human knee to only the front and rear motion, the rear joint since the posterior condyles end of the femur member collides with the side ligaments because the femur joint member into contact with the upper surface of the bearing member to also a horizontal axis of twisting rotation is a by cutting the outer edge of the end to form a chamfer. Also preferred that the outer chamfer 191 is formed of a gently curved shape protruding to the outside, this and so as to minimize damage to the side ligament if that plane horizontal axis rotation of the femur joint member 100, more Furthermore, the winding rotation of the knee joint is smooth to allow for.

Then also look at the artificial knee joint in accordance with another embodiment of the present invention will be described with reference to Figure 7 to the femur joint member 100 includes an outer chamfer 191, inner chamfer 193, as well as the rear condyles end 190. The Which of the femur joint member in order to prevent this, since it conflicts with the posterior cruciate ligament in the center by a horizontal axis twisting rotation in the case of the artificial knee joint of the CR type treatment nor to remove the posterior cruciate ligament femoral coupling as described in said member is a by cutting the inner corner of the rear end condyles to form a chamfer. May be made in a smooth curved shape of intergranular recessed inward the inner chamfer (193), so intergranular is forming a recessed curved plane horizontal axis rotation in the upper part of the femur joint member 100 has the bearing elements (500) since the rotation center of the posterior cruciate ligament of the shaft to form as close to the chamfer of the circular inner edge of the rear end of condyles (190) about said axis is because the most desirable if the.

With reference to Fig. 8, looking for yet another embodiment of the invention, the bearing member 500 according to the present invention the thus becomes bent slightly forward case, which straighten the actual knee completely to a rear chamfer 541 the back and the rear protrusion includes a bearing member 500 by the impact ligament is presented a problem of damaging the ligament of the back side occurs. To solve this problem, the bearing member 500 according to the present invention was to avoid the cutting of a conventional rear projection by forming the rear chamfer 541 do not conflict with the ligaments of the back side. In addition, the rear chamfer 541 is preferably recessed with the inside surface formed of a shape. Thus, it is possible to realize a knee ligament for preventing damage of the present invention.

Embodiment discussed earlier is (described as those of ordinary skill in the art '), those of ordinary skill in the art that only the preferred embodiment an example that enables to easily conduct the artificial knee joint according to the invention, the embodiments described above and it limited in the accompanying drawings it is not not Thus the scope of the present invention limited to. Accordingly, will be that possible various changes and modifications may be made without departing from the scope of the present invention apparent to those skilled in the art, included, it is obvious to the scope of the present invention can easily change part by one of ordinary skill in the art.

Claims (10)

  1. In the artificial knee joint comprising a bearing member positioned between the femur joint member and the tibia joint member, the femur joint member and the tibia joint member that is coupled to the tibial end coupled to the distal femur,
    The femur joint member that is a knee to prevent the ligament by including a chamfer outside chamfer at the outer edge of the rear end condyles preventing the collision with the side ligament.
  2. According to claim 1,
    The femur joint member that is a knee to prevent ligament injury by preventing the collision with the posterior cruciate ligament, including further a chamfer at the inner chamfer the inner edge of the rear end of condyles.
  3. The method of claim 1, wherein the outer chamfer has knee ligament for preventing damage, characterized in that a chamfer with a gentle convex curved surface.
  4. The method of claim 2, wherein the inner chamfer is artificial knee joint for preventing ligament damage, characterized in that a chamfer to smooth concave curved shape to the inside of the constriction.
  5. The method according to any one of the preceding claims,
    The bearing element is characterized in that to comprise a rear projection projected upwardly from the rear, and the rear projection comprises a rear chamfer formed by a predetermined depth chamfers downward, preventing the collision with the rear chamfer is ligament knee ligament for preventing damage.
  6. 6. The method of claim 5,
    The rear has a chamfer for the knee ligament damage prevention, characterized in that a chamfer with a gentle curved surface with concave depressions.
  7. In the femoral engaging portion coupled to the distal femur,
    Femur joint member which in order to prevent the ligament as by preventing the collision with the side ligament comprising a lateral chamfer chamfer with a smooth convex curved surface on the outer edge of the rear end condyles of the femur joint member.
  8. The method of claim 7, wherein the femur joint member is a ligament as to further comprise a inner chamfer chamfer with a smooth concave curved surface shape of the constriction to the inside from the inner edge of the posterior condyles end of preventing the collision with the posterior cruciate ligament femur joint member that to prevent.
  9. In the bearing member between the femur joint member and the tibia joint member, the bearing member comprises a rear projection projected upwardly from the rear, the rear projection is a rear chamfer with a gentle curved surface with concave depressions includes a chamfer, the bearing member, characterized in that to the rear chamfer it is to avoid the collision with the ligament.
  10. 10. The method of claim 9, wherein the bearing and the member further comprises a front projection projecting upwardly from the front, the front protruding portion that can be prevented is formed higher than the height of a natural knee movement and anterior dislocation of the rear projection bearing element according to claim.
PCT/KR2009/000104 2008-01-08 2009-01-08 Artificial knee joint for preventing ligament injury WO2009088238A2 (en)

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KR10-2008-0002244 2008-01-08
KR1020080002244A KR100901528B1 (en) 2008-01-08 2008-01-08 Artificial knee joint apparatus for preventing from damaging ligament

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US9592127B2 (en) 2005-12-15 2017-03-14 Zimmer, Inc. Distal femoral knee prostheses
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US8628580B2 (en) 2010-07-24 2014-01-14 Zimmer, Inc. Tibial prosthesis
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US8764840B2 (en) 2010-07-24 2014-07-01 Zimmer, Inc. Tibial prosthesis
US9295557B2 (en) 2010-07-24 2016-03-29 Zimmer, Inc. Asymmetric tibial components for a knee prosthesis
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US8568486B2 (en) 2010-07-24 2013-10-29 Zimmer, Inc. Asymmetric tibial components for a knee prosthesis
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US9173744B2 (en) 2010-09-10 2015-11-03 Zimmer Gmbh Femoral prosthesis with medialized patellar groove
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EP3348236A1 (en) * 2010-09-10 2018-07-18 Zimmer, Inc. Motion facilitating tibial components for a knee prosthesis
US8591594B2 (en) 2010-09-10 2013-11-26 Zimmer, Inc. Motion facilitating tibial components for a knee prosthesis
US9314343B2 (en) 2010-09-10 2016-04-19 Zimmer, Inc. Motion facilitating tibial components for a knee prosthesis
US10322004B2 (en) 2010-09-10 2019-06-18 Zimmer Gmbh Femoral prosthesis with lateralized patellar groove
US10188530B2 (en) 2010-12-17 2019-01-29 Zimmer, Inc. Provisional tibial prosthesis system
US9060868B2 (en) 2011-06-16 2015-06-23 Zimmer, Inc. Femoral component for a knee prosthesis with bone compacting ridge
US8551179B2 (en) 2011-06-16 2013-10-08 Zimmer, Inc. Femoral prosthesis system having provisional component with visual indicators
US9629723B2 (en) 2011-06-16 2017-04-25 Zimmer, Inc. Femoral component for a knee prosthesis with improved articular characteristics
US10070966B2 (en) 2011-06-16 2018-09-11 Zimmer, Inc. Femoral component for a knee prosthesis with bone compacting ridge
US10045850B2 (en) 2011-06-16 2018-08-14 Zimmer, Inc. Femoral component for a knee prosthesis with improved articular characteristics
US9993345B2 (en) 2011-06-16 2018-06-12 Zimmer, Inc. Femoral prosthesis system
US9308095B2 (en) 2011-06-16 2016-04-12 Zimmer, Inc. Femoral component for a knee prosthesis with improved articular characteristics
US8932365B2 (en) 2011-06-16 2015-01-13 Zimmer, Inc. Femoral component for a knee prosthesis with improved articular characteristics
US9655728B2 (en) 2011-11-18 2017-05-23 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9186255B2 (en) 2011-11-18 2015-11-17 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9788954B2 (en) 2011-11-18 2017-10-17 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US8690954B2 (en) 2011-11-18 2014-04-08 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9204970B2 (en) 2011-11-18 2015-12-08 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9295558B2 (en) 2011-11-18 2016-03-29 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9925050B2 (en) 2011-11-18 2018-03-27 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9655729B2 (en) 2011-11-18 2017-05-23 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US8764838B2 (en) 2011-11-18 2014-07-01 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9072607B2 (en) 2011-11-18 2015-07-07 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US8858643B2 (en) 2011-11-18 2014-10-14 Zimmer, Inc. Tibial bearing component for a knee prosthesis with improved articular characteristics
US9707089B2 (en) 2011-11-21 2017-07-18 Zimmer, Inc. Tibial baseplate with asymmetric placement of fixation structures
US9308096B2 (en) 2011-11-21 2016-04-12 Zimmer, Inc. Tibial baseplate with asymmetric placement of fixation structures
US10265181B2 (en) 2011-11-21 2019-04-23 Zimmer, Inc. Tibial baseplate with asymmetric placement of fixation structures
US8758444B2 (en) 2011-11-21 2014-06-24 Zimmer, Inc. Tibial baseplate with asymmetric placement of fixation structures
US10130375B2 (en) 2014-07-31 2018-11-20 Zimmer, Inc. Instruments and methods in performing kinematically-aligned total knee arthroplasty
US10278827B2 (en) 2015-09-21 2019-05-07 Zimmer, Inc. Prosthesis system including tibial bearing component
US10136997B2 (en) 2015-09-29 2018-11-27 Zimmer, Inc. Tibial prosthesis for tibia with varus resection

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